Share 'Pollination for indoor grow'

My Aquaponics system is strictly indoors. I'm using MH lighting over lettuce and switch to Sodium Halide for bloomers and veggie bearing on the other end. My cucumbers begin growing and then dry up and my bell peppers are in full bloom but producing no fruit. How do I pollinate? The room is large and my system has 2 floating rafts and 2 media beds along with the 300 gallon fish tank..Lettuce and…